Description
ZF IRM 350 P 4.5 Gearbox
The ZF IRM 350 P with a 4.5 ratio (approx. 4.536:1) is a heavy-duty marine transmission designed for commercial or pleasure craft. It handles input power up to roughly 372 kW (498 hp) at 1,800 rpm, utilizing precision helical gears for reliable power transfer.
Core Specifications
- Brand/Model: ZF IRM 350 P
- Gear Ratio: 4.536:1 (4.5 P)
- Max Input Power: ~372 kW (498 hp) at 1,800 RPM (higher ratings for light duty)
- Dry Weight: ~235 kg
- Application: Marine propulsion with SAE housing compatibility
Standard Configuration & Mechanical Features
- Housing Mounting: Standard SAE-1 configuration
- Input Coupling: 14-inch high-flexibility torsional coupling
- Control System: Available in mechanical or 12V/24V electrical hydraulic shift setups
- Full Power Reverse: Features identical reduction ratios and full power capability in both forward and reverse output rotations. This makes it ideal for twin-engine installations
- Hydraulic System: Integrated oil pump, control valve block, mechanical oil filter, and integrated mounting brackets
- Cooling: External copper-nickel sea-water transmission cooler bundle (typically paired with commercial engines like the MAN D2876 series)
Target Applications
This gearbox is engineered by the MPM division of the ZF Group. It is primarily targeted toward: [1]
- Deep-sea commercial fishing boats
- Workboats and tugs demanding high torque at low shaft speeds
- Continuous-duty displacement vessels
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